asp.net-mvc 如何从服务器下载文件到客户端？
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How to download a file to client from server?
提问by Vanquiza
I have an MVC project where I'd like the user to be able to download a an excel file with a click of a button. I have the path for the file, and I can't seem to find my answer through google.
我有一个 MVC 项目，我希望用户能够通过单击按钮下载一个 excel 文件。我有文件的路径，我似乎无法通过谷歌找到我的答案。
I'd like to be able to do this with a simple button I have on my cshtml page:
我希望能够使用我的 cshtml 页面上的一个简单按钮来做到这一点：
<button>Button 1</button>
How can I do this? Any help is greatly appreciated!
我怎样才能做到这一点？任何帮助是极大的赞赏！
回答by Darin Dimitrov
If the file is not located inside your application folders and not accessible directly from the client you could have a controller action that will stream the file contents to the client. This could be achieved by returning a FileResultfrom your controller action using the Filemethod:
如果该文件不在您的应用程序文件夹中并且无法直接从客户端访问，您可以使用控制器操作将文件内容流式传输到客户端。这可以通过FileResult使用以下File方法从控制器操作返回 a 来实现：
public ActionResult Download()
{
string file = @"c:\someFolder\foo.xlsx";
string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
return File(file, contentType, Path.GetFileName(file));
}
and then replace your button with an anchor pointing to this controller action:
然后将您的按钮替换为指向此控制器操作的锚点：
@Html.ActionLink("Button 1", "Download", "SomeController")
Alternatively to using an anchor you could also use an html form:
除了使用锚点，您还可以使用 html 表单：
@using (Html.BeginForm("Download", "SomeController", FormMethod.Post))
{
<button type="submit">Button 1</button>
}
If the file is located inside some non-accessible from the client folder of your application such as App_Datayou could use the MapPathmethod to construct the full physical path to this file using a relative path:
如果文件位于应用程序的客户端文件夹中无法访问的某个位置，例如App_Data您可以使用该MapPath方法使用相对路径构造该文件的完整物理路径：
string file = HostingEnvironment.MapPath("~/App_Data/foo.xlsx");
回答by yuvan pradeep
HTML:
HTML：
<div>@Html.ActionLink("UI Text", "function_name", "Contoller_name", new { parameterName = parameter_value },null) </div>
Controller:
控制器：
public FileResult download(string filename) {
string path = "";
var content_type = "";
path = Path.Combine("D:\file1", filename);
if (filename.Contains(".pdf"))
{
content_type = "application/pdf";
}
return File(path, content_type, filename);
}
